Symposium

Saturday, September 30, 2017

Deadly West Nile Virus Cases Are Spiking In LA. The First Line Of Defense: Chickens

BY USHA LEE MCFARLING

PBS/STAT

Image Via Tour D'Coup

EL MONTE, CALIF. — The chickens are used to the needles.

They don’t fuss when vector ecologist Tanya Posey pulls opens the door of a coop in a community garden here, firmly grasps a Leghorn, and pulls a blood sample out of its wing vein. She’s so good, she can bleed a chicken in about 30 seconds.

That’s helpful, because she has a lot of chickens to test.

More than six dozen sentinel chickens, living in coops dotted around Los Angeles, make up one of the first lines of defense in this sprawling county’s fight against West Nile virus. The disease has been a background threat for years here, but cases have spiked this fall to worrisome levels. Six deaths have been reported by Los Angeles County this year — including three just last week.

And the cases are alarmingly severe: Of 98 reported infections here this year, 79 have led to serious neurological side effects, and 87 have required hospitalization. Because it’s still peak mosquito season, more deaths are expected.

So local public health officials this week launched an all-out attack. They’re sending teams of green-shirted vector control agents door to door to tell residents to wear bug spray, install window screens, and dump the stagnant water where the insects breed. They’re plastering the county with posters that read “It’s Not Just a Bite” and “No Es Solo Un Piquete.”

They’ve even created a rap video featuring a fetid swimming pool, a giant dancing mosquito, and teams of uniformed agents rapping, “You’ve got to dump the water out, drain the water flow, tip the water out, toss the water slow.”

On a national level, a duo from Johns Hopkins and the Bill & Melinda Gates Foundation last week petitioned for a new mosquito emoji, arguing that it could lend some buzz to public health efforts.

West Nile virus causes no symptoms in 8 of 10 infected people, according to the Centers for Disease Control and Prevention. But some, particularly the very young and very old, can get fevers, fatigue, and flu-like symptoms. (Dr. Lyle Petersen, the director of the CDC’s division of vector-borne diseases, experienced that misery himself back in 2003, when he was infected with West Nile virus after going out to pick up his mail without insect repellent.)

The virus has caused more than 2,000 deaths in the U.S. since it first appeared in New York in 1999. States hit hardest in recent years include California, Arizona, Texas, Colorado, Oklahoma, Nebraska, and South Dakota. This year, 22 states have already reported 49 deaths and 658 of the most severe cases, known as “neuroinvasive,” which can involve meningitis, encephalitis, and paralysis.

But at least here in Southern California, residents don’t seem to be concerned.

“You can’t imagine how much outreach we’re doing, but it’s really hard to get people to pay attention,” said Kelly Middleton, who directs community affairs for the Greater Los Angeles County Vector Control District.

Some experts blame complacency, because West Nile is old news. Others blame the months of media coverage over the past year on Zika, another mosquito-borne virus that can cause grave birth defects when it infects pregnant women. Though there’s no evidence Zika is being transmitted by mosquitoes in Southern California, residents nonetheless seem focused on that — instead of the far more prevalent threat of West Nile.

“Certainly we all care about infants and birth defects, so Zika gets a lot of attention,” said Dr. Benjamin Schwartz, deputy chief of the county’s program for acute communicable disease control. “But West Nile causes more deaths than Zika does — and it causes them every year.”

To control West Nile virus, first you have to know where it’s lurking. It’s a monumental task for the district, which covers a territory of more than 1,340 square miles — roughly the size of Rhode Island.

The district has some 180 mosquito traps. Checking them all involves grueling drives five days a week by two field assistants.

But simply detecting virus inside mosquitoes doesn’t confirm that the insects are infectious. Finding infected birds does. The district collects and tests dead birds — crows and blue jays — when residents alert them, but such reports can be spotty.

So the district relies on its sentinel chickens, checking their blood for West Nile virus antibodies every two weeks.

On a recent day, Posey and her teammate Harold Morales checked a group of 10 white Leghorns — the iconic white chickens with bright red combs. (An attempt to use Rhode Island Reds failed miserably; the birds couldn’t handle the Southern California heat.) Seven of the chickens had already tested positive for West Nile, so Morales bled the three that hadn’t, dropping a few milliliters of blood onto filter papers he would later send to a state testing lab.

“It’s just like going to the doctor and getting a blood sample,” said Susanne Kluh, who heads disease surveillance for the district. “Some get feisty, but it’s pretty easy on the chickens.”

Wild birds don’t seem to mind the needles, either. Many that have been trapped for surveillance, banded, and released return repeatedly to the traps — where they can be tested again to see if they have immunity. “They give their blood and get free food,” Middleton said. “The same birds come back week after week.”

Unlike sparrows, finches, jays, and crows — which can die from West Nile and also transmit it to new mosquitoes — chickens don’t get sick or spread the virus. Indeed, the sentinel Longhorns are healthy enough that local gardeners gather their eggs and use their manure for fertilizer. Once testing season ends in late fall, the birds are given away — for pets or meat. “They’re good eating,” said Kluh.

And they’re good data generators, helping Kluh and colleagues generate a precise mapof where the virus is active. The district can then target outreach and abatement efforts.

Human cases are too slow to be useful for surveillance, she said, because people often don’t go to the doctor right away and doctors don’t always report cases. (Indeed, the number of actual West Nile deaths is likely higher than stated because of underreporting, public health officials say.)

An army of invading mosquitoes

Los Angeles County public health officials credit the vector control district with keeping the outbreak from being far worse. But for Kluh and her team, every West Nile death is difficult.

“It’s hard,” Kluh said. “We take it really personally.”

This month, 84-year-old Julia Shepherd, an active grandmother from a Los Angeles suburb, died of West Nile after becoming paralyzed and disoriented.

The case is exactly the type public health officials fear, one that robs healthy older adults — those most likely to be outdoors — of either their lives or their independence. Some half of older adults who have been infected with neurological symptoms have still not recovered their ability to function independently after a year, Schwartz said.

While they’re focussed on West Nile, which is transmitted by Culex mosquitoes, Kluh and her team do still monitor the spread of Aedes aegypti, which can transmit Zika. She’s also tracking Aedes albopictus, the Asian tiger mosquito that’s a carrier of dengue and chikungunya. And she’s got her eye on the newly arrived Aussie Mozzie mosquito — Aedes notoscriptus — that transmits yet other viruses.

“I guess I’ve got job security,” she joked.

Kluh sees a silver lining in the invasion of these aggressive new species. Unlike California’s resident Culex mosquitoes, the newcomers bite humans more than birds, bite all day long, and tend to raise welts that are itchier and more noticeable. Because of this, many people here are finally starting to complain about mosquitoes — and that’s music to Kluh’s ears.

FROM THE ARCHIVES: THE AMBROSE EHIRIM-CHIKA UNIGWE INTERVIEW

Every writer has to be able to live in the head of her characters. I had to make myself a blank blackboard for the characters to inscribe their lives on me. I had to wipe off that board every time a new character had to be created and totally surrender myself to that new character.

FROM THE ARCHIVES: INTERVIEW: THE SYLVESTER MENSAH STORY

The idea of writing a book had always engaged my thoughts based on reflections and the desire to share my experiences. The motivation was however triggered after reading the book of a gentleman l consider the busiest in Ghana, H. E. John Dramani Mahama

FROM THE ARCHIVES: INTERVIEW: DR. APOLLOS NWAUWA

Contrary to what many think, the Igbo Diaspora is not really a homogenous, coherent group. Like other ethnic nationalities in the USA, the Igbo Diaspora consists of peoples from all walks of life separated by everything and only united by the fact that they are all Igbo. Serious social class disparity exists between them; therefore, presenting a united front in influencing or engineering actions at home continues to be a challenge.

FROM THE ARCHIVES: INTERVIEW: OZO'S KENI SAINT GEORGE

It was indeed a very boisterous, purpose driven, well-to-do Royal family. I come from a lineage of Royals and a well groomed family unit. My Father, Chief George Ozuloke, was a Court Judge for all of 18 years. He was both a Christian and Animist. He had 7 wives of which my mother was the first. I went to St. Martins Primary School and later to a wonderful School – Abbot Secondary Grammar School in Ihiala, my town. I even did a stint in Ihiala Seminary trying to be a Catholic Priest

FROM THE ARCHIVES: INTERVIEW: JULIUS KPADUWA

The problems that confront Imo State are really not unique. It is the same problem that confronts almost every state in Nigeria, and it's one of economic development. The primary thing or my clear vision for the people of Imo State will be getting all the able-bodied men and women back to work, so that we can begin to have the quality of life that has so far eluded the people of Imo State.

FROM THE ARCHIVES: THE OTOKOTO SAGA INTERVIEW

Earlier this year, in January, it was reported in the country’s dailies that your father and six others had been condemned to death. Those condemned with your father were: Alban Ajaegbu, Sampson Nnamito, Ebenezer Egwuekwe, Rufus Anyanwu, Lawrence Eboh, and Chief Leonard Unogu. How is your dad related to the names I have mentioned?

FROM THE ARCHIVES: Where We Met

But seeing a Nigeria headline on my screen it then occurred to him I must either be a Nigerian or perhaps a curious minded fellow who is reading to find out about the notorious Boko Haram, if they have captured more of their victims, or if there's an ongoing battle between the insurgents and the nation's security forces. Elevating my head up and starring at each other, I told him I was Igbo

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About Me

Ambrose Ehirim is a blogger, a writer, a photo-journalist, a volunteer and teacher. He has published articles and essays in African Times, African Watch, Pace News, Los Angeles Weekly, Life & Time Magazine, Kilima, American Chronicle, Long Beach Sentinel, Reuters and many other publications. He was former editor of New Life and West Coast Bureau Chief at the BNW Magazine. An Anti-Igbo Pogrom scholar and researcher, and currently working on and researching the 'Eastside Groups and Bands' Vintage Years.'

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